In a letter published Jan. 9, “Climate science is based on facts, not theories” [The Calvert Recorder], Phil Zalesak did a fine job of providing some facts with regard to climate science. It is only his conclusion or theory that is suspect.

As noted, water vapor, carbon dioxide and methane account for a small percentage of the earth’s atmosphere. However, to simply jump to the conclusion that since the percentages are so small, any increase cannot possibly have an effect on the earth’s climate, is hardly scientific at all. In fact, evidence of small percentages having dramatic effects are found throughout nature. One example involves the most toxic substance known to man, botulinum toxin, which is fatal to the average human being at .000000000000003 percent of body weight. Just a teaspoon of the stuff would be enough to kill roughly 200 million people. If the above percentage is hard to wrap your head around, just imagine that medical doctors use the toxin in “minuscule” amounts, known as Botox, to reduce wrinkles.